PSA:

psychosis means literally mind sickness

psychopath means literally one who has a mind sickness

mind is not physical, it is a product of the physical brain and the nervous system as a whole (we have a lot of memory stored in those nerves outside of our skull)

the most difficult thing for people suffering from mind sickness is to accept that they may have a sickness in their mind

it ties to their sense of self and while it's normal for people to have delusions from time to time, when they become part of a person's identity you have... mind sickness